We’ll also discuss how to look for rare cards, how to read the rarity symbols and letters on your cards, why you should consider having your cards graded, and how to turn your collection into cash. Here, we’ll discuss these factors in greater detail. The two main factors that determine the value of Pokemon cards are rarity and condition. While some cards are common and may not be worth much, there are certain cards – such as secret rare cards, holographic cards, ultra rare cards, and more – which can be worth a pretty penny. Do you have a stash of Pokemon cards? With so many of them climbing in value in recent years, you may be curious whether your personal childhood collection carries any special value.